XV111 KEY TO THE ORDERS. 



. Stamens 10, 5 of them longer. Styles 5, 

 distinct. Leaflets 3, obcordate, drooping at night- 

 fall ....................................... ". . . 42 



* * Stamens jusi as many as the lobes of the corolla, one in y 



of each lobe. 



PBIMULACE^E. Stamens on the corolla. Style 1. Ovary 

 1-celled, with a free central placenta rising from 

 the base ..... ................................ 1 45 



PLUMBAGINACE^E. Styles 5. Ovary 1-celled and 1-seeded. 144 



* * * Stamens just as many as the lobes of the cor ollaf Inserted on 



its tube alternately with its lobes. 



+- Ovaries 2, separate. 

 ApocYNACEjE. Plants with milky juice. Anthers converg- 



ing round the stigmas, but not adherent to them. 



Filaments distinct ............................ 179 



AsCLEPiADACEjE. Plants with milky juice. Anthers ad- 



hering to the stigmas. Filaments monadelphous. 



Flowers in umbels ............................ 179 



-H -l- Ovary 4-lobed around the base of the style. 

 Mentha, in 



LABIATE. Stamens 4. Leaves opposite, aromatic ..... 160 

 BORRAGINACE.E. Stamens 5. Leaves alternate ......... 167 



i- -i f- Ovary 1-celled ; the seeds on the walls. 



HYDROPHYLLACE^E. Stamens 5, usually exserted. Style 



2-cleft. Leaves lobed and sometimes cut-toothed. 171 



GENTIANACE.E. Leaves entire and opposite ; or (in Men- 



yanthes) of 3 leaflets ......................... 176 



4- -l- -f- 4- Ovary with 2 or more cells. 



AQUIFOLIACE^E. Shrubs. Corolla almost polypetalous. 



Calyx minute. Fruit a red berry-like drupe. 



Parts of the flower chiefly in fours or sixes ..... 145 

 PLANTAGINACE^;. Stamens 4. Pod 2-celled. Flowers in 



a close spike .................................. 148 



Verbaseum, in 



SCROPHULARIACE^E. Corolla nearly regular. Flowers in a 

 long terminal spike. Stamens 5 ; the filaments, 

 or some of them, woolly ....................... 151 



POLEMONIACE^. Style 3-cleft. Corolla salver-shaped, 

 with a long tube. Pod 3-celled, few-seeded ; 

 seeds small . .,..,..,...,, ........ ,.,....,... 172 



